Optical frequency comb generation based on electro-optical modulation with high-order harmonic of a sine RF signal

By using cascaded intensity and phase modulators, optical frequency comb (OFC) is generated. In the OFC generation scheme, high-order harmonic of a RF signal is used for driving intensity modulator (IM) or phase modulator (PM). Experimental and theoretical results indicate when IM is driven by high-order harmonic, lower RF driving power for PM is required to generate an OFC with the best flatness.